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Multifocal contact lens design

Multifocal contact lens design

Can you explain the reason that some concentric multifocals have center near correction / peripheral distance and others are center distance / peripheral near? What is the effect to the wearer? How are the majority designed?
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All grinding/design optics of multifocal and accommodating IOLs are patented and propriatary. Since there are a number of different types/ models there is no consensus on the best type. Optical testing generally accords aspheric accomodating IOLs as having the best optics.

JCH MD
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